Former President Mwai Kibaki's Party of National Unity (PNU) on Wednesday celebrated its 15th anniversary.
The party is currently under the leadership of ex-Meru Governor Peter Munya.
PNU was the late President Kibaki's political vehicle that delivered him to the State House for a second term in 2007.
Kibaki was declared winner of the disputed polls against which ODM's Raila Odinga was his closest rival.